Anyone added the JB stage 1 or 2 and not immediately upgraded the exhaust? Better to wait and both mods at the same time? Or does the JB stand on its own?

Champaign problems I know...but I just paid for H&R Sport Springs, staggered 20x9-20x10.5 graphite Vossen CV3, and Continental Extreme Grip DWs (go on my 2012 535i xDrive next week) and I'd like to add JB while they have it in the shop. Buying an engagement ring this month too so trying to not get too crazy and do exhaust in late summer.